Boone, Crustacea, Cruises of ''Eagle" and "Ara," 1921-28 195 



directed than the second and third teeth, which are subequal and 

 outward and forward directed. The postlateral margins are subpar- 

 allel; although the moderately tumid hepatic regions contrasted with 

 the deflexed posterior branchial regions of the carapace cause the lat- 

 eral margins to seem more convergent ; the posterior margin which is 

 slightly sinuate but roughly parallels the general trend of the anterior 

 margin. The regions of the carapace are distinctly delineated; the 

 mesogastric region is moderatelj^ inflated, forming a broad, transverse 

 oval on the anterior part of the carapace, which is defined by the 

 cervical grooves laterally and is confluent posteriorly with the uro- 

 gastric area, which is indicated by very deep depressions on each side 

 connected by a transverse channel; two deep grooves contiguous an- 

 teriorly with the urogastric depressions curve around the cardiac- 

 intestinal area and are united posteriorly by a faint transverse de- 

 pression parallel to and near the posterior margin of the carapace. 

 The side walls of the carapace are deeply vaulted ; the pterygostomian 

 region is prominent. The epistome is well developed and prominent. 



The eyes are large and fill the ocular cavitj', the stalks are short, 

 cylindrical ; the cornea is conspicuously dilated and about as long as 

 the stalk. 



The antennulae have the basal article filling more than half the fos- 

 sett, dilated basally, curved and constricted distally, the second article 

 is long, very slender, cylindrical, the third article similar, but a trifle 

 shorter and slenderer; the flagella are quite small, less than half the 

 length of the preceding joint, the smaller branch consists of five slen- 

 der, tapering articles ; the stouter branch consists of thirteen conically 

 tapering articles which bear a thick, plumose brush on the ventral 

 side. 



The maxillipeds have a small, basal article, a long, rectangular 

 exognath which is produced on the inner margin adjacent to the base 

 of the merus into triangular process which interfits with the merus 

 of the endognath ; the palp of the exognath is longer than the basal 

 article and very slender ; it consists of a basal article as long as half 

 the width of the merus and about 16 small, subequal tapering rings 

 which are set along the outer margin with very long, feathery setae. 

 The ischium of the endognath is rectangular, one and one-half times 

 as long as wide; the merus is squarish, with the lower inner margin 

 a little rounded; the palp arises from the inner distal angle of the 

 merus, is rounded and consists of three tapering joints which curve 

 downward beside the inner margin, extending to near the middle of 



